4/14/2023 0 Comments Gravity circuit gold miningThe high-grade composite gold recovery in the sulphide concentration of the gravity tails reported 93% gold recovery with 98.8% recovery in POX within 24 hours. Preliminary results of this initial testwork is very encouraging, with a combined total gold recovery of POX and cyanide leach of the sulphide concentrate of 92.1% in the high-grade composite samples. Overall recovery means including gravity, flotation, regrind, pressure oxidation, and cyanide.įlotation rougher concentrate with a recovery of 95% for the high-grade composite graded up to 41 g/t Au with approximately up to a 7.0 % sulphide component. Table 1 – POX Residue Cyanidation Test Results SummaryĬonditions that prevailed for current testwork are as follows: 30% solids (w/w), 1 gram/liter NaCN (cyanide), pH between 10.5 and 11.0 dissolved oxygen between 8-9 ppm 24 hours retention time, and 4 grams of carbon added. This was followed by a finer grind of the flotation concentrate to 80% passing 28 microns, and a pressure oxidation (POX) of the reground concentrate. The SGS metallurgical test program consisted of a coarser grind (80% passing approximately 100 microns) with an initial gravity recovery, followed by a sulphide flotation concentration of the gravity tails. Core rejects were composited from high grade lodes (approximately 10 g/t Au), and a second composite generated from low grade material (approximately 1.5 g/t Au) adjacent to the high-grade composites. This hole was designed to cross the Yellorex Zone obliquely to obtain a representative sample of the deposit. Metallurgical testwork was performed by SGS Lakefield (SGS) on core reject samples obtained from drill hole GTCM22-030 (6.41/t gold over 26.50 metres including 9.05 g/t over 4.00 metres 10.66 g/t gold over 3.0 metres and 14.15 g/t gold over 5.50 metres, (see news release April 6, 2022). The Yellorex zone is currently drilled at shallow depths (surface to approximately 300 metres), and therefore was expected to be refractory. Nerco, with selective free milling ores, achieved up to 95% recovery, while Miramar Mining increased the throughput from 800 ton per day (tpd) to 1400 tpd and achieved 88 to 90% recovery by mixing free milling ore with refractory ore after the acquisition from Nerco in 1993. In the more recent years (1987-2003), the former Con Mine operated with a flow sheet including a gravity circuit, a flotation circuit, follow by a Pressure Oxydation (POX) Circuit, or autoclave. Historically gold mineralization encountered at shallower depths in the mine (generally above 1000m) was likely refractory gold, while deeper mining was free-milling gold, hence a gravity circuit was added by Nerco in 1989. The Con mine (1938-2003) produced over 6M oz of gold over more than 50 years mine life. produce gold on site through the POX process.Results provide Gold Terra with two potential product paths for Yellorex mineralization either to:.Excellent gold assays reporting up to 98.8% of gold in the flotation concentrate with close to 7% sulphide content.
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